JP2015068176A - Attachment structure of nozzle plate for fuel injection device - Google Patents

Attachment structure of nozzle plate for fuel injection device Download PDF

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JP2015068176A
JP2015068176A JP2013200198A JP2013200198A JP2015068176A JP 2015068176 A JP2015068176 A JP 2015068176A JP 2013200198 A JP2013200198 A JP 2013200198A JP 2013200198 A JP2013200198 A JP 2013200198A JP 2015068176 A JP2015068176 A JP 2015068176A
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nozzle plate
valve body
fuel injection
injection device
end side
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JP2013200198A
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JP6143623B2 (en
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幸二 野口
Koji Noguchi
幸二 野口
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Enplas Corp
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Enplas Corp
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Priority to JP2013200198A priority Critical patent/JP6143623B2/en
Priority to CN201480052564.8A priority patent/CN105579699B/en
Priority to US15/025,003 priority patent/US20160237968A1/en
Priority to EP14850083.8A priority patent/EP3051116B1/en
Priority to PCT/JP2014/074779 priority patent/WO2015046029A1/en
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Abstract

PROBLEM TO BE SOLVED: To provide an attachment structure of a nozzle plate for a fuel injection device capable of reducing manufacturing man-hours of the fuel injection device, and capable of reducing the manufacturing cost of the fuel injection device.SOLUTION: A nozzle plate 3 is fixed to an end side of a valve body 5 only by press-fitting a cylindrical fitting part 12 of the nozzle plate 3 to the end side of the valve body 5 and hooking a claw 25 of an arm 10 of the nozzle plate 5 to a locking protrusion 8 of the valve body 5. When a thermal expansion difference or a manufacturing error occurs between the nozzle plate 3 made of a synthetic resin material and the valve body 5 made of metal, a spring action portion 24 of the arm 10 is elastically deformed, and the thermal expansion difference or the manufacturing error between the nozzle plate 3 and the valve body 5 is absorbed, and a tilt surface 27 of the claw 25 of the arm 10 is always pressed to the locking protrusion 8 by elastic force of the spring action portion 24, and a bottom wall 14 of the nozzle plate 3 is always pressed to an end surface 13 of the valve body 5 by tilt surface component force acting on the tilt surface 27.

Description

この発明は、燃料噴射装置の燃料噴射口から流出した燃料を微粒化して噴射するために使用される燃料噴射装置用ノズルプレート（以下、適宜「ノズルプレート」と略称する）の取付構造に関するものである。   The present invention relates to a structure for mounting a nozzle plate for a fuel injection device (hereinafter abbreviated as “nozzle plate” as appropriate) used to atomize and inject fuel flowing out from a fuel injection port of a fuel injection device. is there.

自動車等の内燃機関（以下、「エンジン」と略称する）は、燃料噴射装置から噴射された燃料と吸気管を介して導入された空気とを混合して可燃混合気を形成し、この可燃混合気をシリンダー内で燃焼させるようになっている。このようなエンジンは、燃料噴射装置から噴射された燃料と空気との混合状態がエンジンの性能に大きな影響を及ぼすことが知られており、特に、燃料噴射装置から噴射された燃料の微粒化がエンジンの性能を左右する重要な要素となることが知られている。   An internal combustion engine such as an automobile (hereinafter abbreviated as “engine”) mixes fuel injected from a fuel injection device and air introduced through an intake pipe to form a combustible air-fuel mixture. Qi is burned in the cylinder. In such an engine, it is known that the mixed state of the fuel and air injected from the fuel injection device has a great influence on the performance of the engine, and in particular, the atomization of the fuel injected from the fuel injection device is reduced. It is known to be an important factor that affects engine performance.

そこで、従来から、図１０に示すように、燃料噴射装置１００は、燃料噴射口１０１が形成された金属製のバルブボディ１０２に金属製のノズルプレート１０３を溶接し、燃料噴射口１０１から噴射された燃料をノズルプレート１０３に形成されたノズル孔１０４を介して吸気管内に噴射することにより、燃料の微粒化を促進するようになっている（特許文献１、２参照）。   Therefore, conventionally, as shown in FIG. 10, in the fuel injection device 100, a metal nozzle plate 103 is welded to a metal valve body 102 in which a fuel injection port 101 is formed, and is injected from the fuel injection port 101. The fuel atomization is promoted by injecting the fuel into the intake pipe through the nozzle hole 104 formed in the nozzle plate 103 (see Patent Documents 1 and 2).

特開平１１−２７０４３８号公報JP 11-270438 A 特開２０１１−１４４７３１号公報JP 2011-144731 A

しかしながら、従来の燃料噴射装置１００は、溶接スパッタがノズルプレート１０３のノズル孔１０４に浸入し、ノズル孔１０４が溶接スパッタで塞がれるのを防止するため、マスキング治具を使用して溶接を行わなければならず、溶接を効率的に行うことが困難であった。その結果、従来の燃料噴射装置１００は、製造工数が嵩み、製造コストの削減が困難であった。   However, the conventional fuel injection device 100 performs welding using a masking jig in order to prevent welding spatter from entering the nozzle holes 104 of the nozzle plate 103 and blocking the nozzle holes 104 by welding spatter. It was difficult to perform welding efficiently. As a result, the conventional fuel injection device 100 has a large number of manufacturing steps, and it is difficult to reduce the manufacturing cost.

そこで、本発明は、燃料噴射装置の製造工数を削減でき、燃料噴射装置の製造コストを削減できる燃料噴射装置用ノズルプレートの取付構造を提供する。   Thus, the present invention provides a nozzle plate mounting structure for a fuel injection device that can reduce the number of manufacturing steps of the fuel injection device and reduce the manufacturing cost of the fuel injection device.

図１乃至図９に示すように、本発明は、燃料噴射装置１の燃料噴射口４から流出した燃料を微粒化して噴射するノズル孔７が形成された燃料噴射装置用ノズルプレート３の取付構造に関するものである。この発明において、前記燃料噴射口４が形成された前記燃料噴射装置１の金属製バルブボディ５は、外周に沿ってリング状の係止用突起８が形成されている。また、前記燃料噴射装置用ノズルプレート３は、前記バルブボディ５の先端側が圧入される筒状嵌合部１２と、前記筒状嵌合部１２の一端側を塞ぐように形成されて前記バルブボディ５の先端面１３が突き当てられると共に前記ノズル孔７が形成された底壁部１４と、前記筒状嵌合部１２の他端側に形成されて前記バルブボディ５の前記係止用突起８に引っ掛けられるアーム部１０と、を有している。また、前記燃料噴射装置用ノズルプレート３の前記筒状嵌合部１２、前記底壁部１４、及び前記アーム部１０は、合成樹脂材料で一体に形成されている。また、前記アーム部１０は、弾性変形させられた状態で使用されるばね作用部分２４と、このばね作用部分２４の先端側に一体に形成されて前記ばね作用部分２４の弾性力で前記係止用突起８に押し付けられる爪部分２５と、を有している。また、前記爪部分２５と前記係止用突起８のいずれか一方には、前記爪部分２５と前記係止用突起８のいずれか他方に当接する傾斜面２７，３４が形成されている。また、前記傾斜面２７，３４は、前記バルブボディ５と前記燃料噴射装置用ノズルプレート３に熱膨張差が生じた場合でも、前記爪部分２５と前記係止用突起８のいずれか他方に前記ばね作用部分２４の弾性力で当接し、前記底壁部１４を前記バルブボディ５の先端面１３に押し付ける斜面分力が生じるようになっている。   As shown in FIGS. 1 to 9, the present invention is a structure for mounting a nozzle plate 3 for a fuel injection device in which nozzle holes 7 for atomizing and injecting fuel flowing out from a fuel injection port 4 of the fuel injection device 1 are formed. It is about. In the present invention, the metal valve body 5 of the fuel injection device 1 in which the fuel injection port 4 is formed has a ring-shaped locking projection 8 formed along the outer periphery. Further, the nozzle plate 3 for the fuel injection device is formed so as to close a cylindrical fitting portion 12 into which the distal end side of the valve body 5 is press-fitted, and one end side of the cylindrical fitting portion 12 so as to close the valve body. 5 and the bottom wall portion 14 where the nozzle hole 7 is formed, and the locking projection 8 of the valve body 5 formed on the other end side of the tubular fitting portion 12. And an arm portion 10 that is hooked onto the arm. Moreover, the said cylindrical fitting part 12, the said bottom wall part 14, and the said arm part 10 of the said nozzle plate 3 for fuel injection apparatuses are integrally formed with the synthetic resin material. Further, the arm portion 10 is formed integrally with a spring action portion 24 used in an elastically deformed state, and a distal end side of the spring action portion 24, and is locked by the elastic force of the spring action portion 24. And a claw portion 25 pressed against the projection 8. Further, inclined surfaces 27 and 34 are formed on one of the claw portion 25 and the locking projection 8 so as to come into contact with the other of the claw portion 25 and the locking projection 8. Further, the inclined surfaces 27 and 34 are formed on the other of the claw portion 25 and the locking projection 8 even when a difference in thermal expansion occurs between the valve body 5 and the fuel injection device nozzle plate 3. A slope component force that abuts with the elastic force of the spring acting portion 24 and presses the bottom wall portion 14 against the tip surface 13 of the valve body 5 is generated.

本発明に係る燃料噴射装置用ノズルプレートの取付構造によれば、ノズルプレートの筒状嵌合部をバルブボディの先端側に圧入すると共に、ノズルプレートのアーム部の爪部分をバルブボディの係止用突起に引っ掛けるだけで、ノズルプレートがバルブボディの先端側に固定されるため、金属製のノズルプレートを金属製のバルブボディの先端に溶接固定する従来例に比較し、燃料噴射装置の製造工数を削減でき、燃料噴射装置の製造コストを削減できる。   According to the mounting structure of the nozzle plate for a fuel injection device according to the present invention, the cylindrical fitting portion of the nozzle plate is press-fitted into the distal end side of the valve body, and the claw portion of the arm portion of the nozzle plate is engaged with the valve body. Because the nozzle plate is fixed to the tip of the valve body simply by hooking it on the projection, the fuel injection device manufacturing man-hours compared to the conventional example where the metal nozzle plate is welded and fixed to the tip of the metal valve body And the manufacturing cost of the fuel injection device can be reduced.

また、本発明に係る燃料噴射装置用ノズルプレートの取付構造によれば、ノズルプレートとバルブボディとの熱膨張差や製造誤差が生じた場合に、ノズルプレートのアーム部のばね作用部分が弾性変形してノズルプレートとバルブボディとの熱膨張差や製造誤差を吸収し、アーム部の爪部分の傾斜面がバルブボディの係止用突起にばね作用部分の弾性力で常時押し付けられるか、又は、アーム部の爪部分が係止用突起の傾斜面にアーム部のばね作用部分の弾性力で常時押し付けられ、ノズルプレートの底壁部が傾斜面に作用する斜面分力でバルブボディの先端面に常時押し付けられるようになっているため、ノズルプレートがバルブボディから脱落するようなことがない。   In addition, according to the nozzle plate mounting structure for a fuel injection device according to the present invention, when a thermal expansion difference or a manufacturing error occurs between the nozzle plate and the valve body, the spring action portion of the arm portion of the nozzle plate is elastically deformed. Absorb the difference in thermal expansion and manufacturing error between the nozzle plate and the valve body, and the inclined surface of the claw part of the arm part is always pressed against the locking projection of the valve body by the elastic force of the spring acting part, or The claw part of the arm part is always pressed against the inclined surface of the locking projection by the elastic force of the spring acting part of the arm part, and the bottom wall part of the nozzle plate acts on the tip surface of the valve body by the slope component force acting on the inclined surface. Since it is always pressed, the nozzle plate does not fall off the valve body.

燃料噴射装置１の使用状態を模式的に示す図である。FIG. 2 is a diagram schematically showing a usage state of the fuel injection device 1. 本発明の第１実施形態に係るノズルプレートの取付構造を示す図である。図２（ａ）が燃料噴射装置の先端側正面図であり、図２（ｂ）が図２（ａ）の矢印Ｃ１で示す方向から見た燃料噴射装置の先端側側面図であり、図２（ｃ）が図２（ａ）のＡ１−Ａ１線に沿ってノズルプレートを切断して示す燃料噴射装置の先端側断面図であり、図２（ｄ）が図２（ａ）のＡ１−Ａ１線に沿って全体を切断して示す燃料噴射装置の先端側断面図である。It is a figure which shows the attachment structure of the nozzle plate which concerns on 1st Embodiment of this invention. 2A is a front view of the front end side of the fuel injection device, and FIG. 2B is a side view of the front end side of the fuel injection device as viewed from the direction indicated by the arrow C1 in FIG. (C) is a front end side sectional view of the fuel injection device shown by cutting the nozzle plate along the line A1-A1 in FIG. 2 (a), and FIG. 2 (d) is A1-A1 in FIG. 2 (a). It is a front end side sectional view of a fuel injection device shown by cutting the whole along a line. 図３（ａ）がノズルプレートの正面図であり、図３（ｂ）が図３（ａ）の矢印Ｃ２方向から見たノズルプレートの側面図であり、図３（ｃ）が図３（ａ）のＡ２−Ａ２線に沿って切断して示すノズルプレートの断面図である。3A is a front view of the nozzle plate, FIG. 3B is a side view of the nozzle plate viewed from the direction of arrow C2 in FIG. 3A, and FIG. 3C is FIG. It is sectional drawing of the nozzle plate cut | disconnected and shown along the A2-A2 line | wire of (). 図４（ａ）がバルブボディの正面図であり、図４（ｂ）がバルブボディの先端側側面図であり、図４（ｃ）が図４（ａ）のＡ３−Ａ３線に沿って切断して示すバルブボディの先端側縦断面図である。4A is a front view of the valve body, FIG. 4B is a front side view of the valve body, and FIG. 4C is cut along line A3-A3 in FIG. 4A. It is the front end side longitudinal cross-sectional view of the valve body shown. ノズルプレートの取付構造を説明するための図である。図５（ａ）が図２（ｃ）の一部を拡大して示す図であり、図５（ｂ）がノズルプレートとバルブボディの熱膨張差や製造誤差を吸収した第１状態の図であり、図５（ｃ）がノズルプレートとバルブボディの熱膨張差や製造誤差を吸収した第２状態の図である。It is a figure for demonstrating the attachment structure of a nozzle plate. FIG. 5A is an enlarged view of a part of FIG. 2C, and FIG. 5B is a diagram of a first state in which a difference in thermal expansion and a manufacturing error between the nozzle plate and the valve body are absorbed. FIG. 5C is a diagram of a second state in which a difference in thermal expansion and a manufacturing error between the nozzle plate and the valve body are absorbed. 本発明の第２実施形態に係るノズルプレートの取付構造を示す図である。図６（ａ）が燃料噴射装置の先端側正面図であり、図６（ｂ）が図６（ａ）の矢印Ｃ３で示す方向から見た燃料噴射装置の先端側側面図であり、図６（ｃ）が図６（ａ）のＡ４−Ａ４線に沿ってノズルプレートを切断して示す燃料噴射装置の先端側断面図である。It is a figure which shows the attachment structure of the nozzle plate which concerns on 2nd Embodiment of this invention. 6A is a front view of the front end side of the fuel injection device, and FIG. 6B is a side view of the front end side of the fuel injection device viewed from the direction indicated by the arrow C3 in FIG. (C) is front end side sectional drawing of the fuel-injection apparatus which cut | disconnects and shows a nozzle plate along the A4-A4 line of Fig.6 (a). 図７（ａ）がノズルプレートの正面図であり、図７（ｂ）が図７（ａ）の矢印Ｃ４方向から見たノズルプレートの側面図であり、図７（ｃ）が図７（ａ）のＡ５−Ａ５線に沿って切断して示すノズルプレートの断面図である。7A is a front view of the nozzle plate, FIG. 7B is a side view of the nozzle plate viewed from the direction of arrow C4 in FIG. 7A, and FIG. 7C is FIG. It is sectional drawing of the nozzle plate cut | disconnected and shown along the A5-A5 line of FIG. 図８（ａ）がバルブボディの正面図であり、図８（ｂ）がバルブボディの先端側側面図である。FIG. 8A is a front view of the valve body, and FIG. 8B is a side view of the front end side of the valve body. ノズルプレートの取付構造を説明するための図である。図９（ａ）が図６（ｃ）の一部を拡大して示す図であり、図９（ｂ）がノズルプレートとバルブボディの熱膨張差や製造誤差を吸収した第１状態の図であり、図９（ｃ）がノズルプレートとバルブボディの熱膨張差や製造誤差を吸収した第２状態の図である。It is a figure for demonstrating the attachment structure of a nozzle plate. FIG. 9A is an enlarged view of a part of FIG. 6C, and FIG. 9B is a diagram of a first state in which a difference in thermal expansion and a manufacturing error between the nozzle plate and the valve body are absorbed. FIG. 9C is a diagram of a second state in which a difference in thermal expansion and a manufacturing error between the nozzle plate and the valve body are absorbed. 従来のノズルプレートの取付構造を示す燃料噴射装置の先端側断面図である。It is a front end side sectional view of a fuel injection device showing the attachment structure of the conventional nozzle plate.

以下、本発明の実施形態を図面に基づき詳述する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

［第１実施形態］
（燃料噴射装置）
図１は、燃料噴射装置１の使用状態を模式的に示す図である（図２参照）。この図１に示すように、ポート噴射方式の燃料噴射装置１は、エンジンの吸気管２の途中に設置され、燃料を吸気管２内に噴射して、吸気管２に導入された空気と燃料とを混合し、可燃混合気を形成するようになっている。 [First Embodiment]
(Fuel injection device)
FIG. 1 is a diagram schematically showing a use state of the fuel injection device 1 (see FIG. 2). As shown in FIG. 1, a port injection type fuel injection device 1 is installed in the middle of an intake pipe 2 of an engine, injects fuel into the intake pipe 2, and introduces air and fuel introduced into the intake pipe 2. To form a combustible mixture.

図２は、燃料噴射装置用ノズルプレート３（以下、ノズルプレートと略称する）が取り付けられた燃料噴射装置１の先端側を示す図である。なお、図２（ａ）は、燃料噴射装置１の先端側正面図である。また、図２（ｂ）は、図２（ａ）の矢印Ｃ１で示す方向から見た燃料噴射装置１の先端側側面図である。また、図２（ｃ）は、図２（ａ）のＡ１−Ａ１線に沿ってノズルプレート３を切断して示す燃料噴射装置１の先端側断面図である。また、図２（ｄ）は、図２（ａ）のＡ１−Ａ１線に沿って全体を切断して示す燃料噴射装置１の先端側断面図である。   FIG. 2 is a view showing the front end side of the fuel injection device 1 to which the fuel injection device nozzle plate 3 (hereinafter abbreviated as a nozzle plate) is attached. 2A is a front view of the front end side of the fuel injection device 1. FIG. Moreover, FIG.2 (b) is the front end side view of the fuel-injection apparatus 1 seen from the direction shown by the arrow C1 of Fig.2 (a). FIG. 2C is a front-end side cross-sectional view of the fuel injection device 1 shown by cutting the nozzle plate 3 along the line A1-A1 of FIG. FIG. 2D is a front end side sectional view of the fuel injection device 1 cut along the line A1-A1 in FIG.

図２に示すように、燃料噴射装置１は、燃料噴射口４が形成された金属製バルブボディ５の先端側に合成樹脂材料製のノズルプレート３が取り付けられている。この燃料噴射装置１は、図外のソレノイドによってニードルバルブ６が開閉されるようになっており、ニードルバルブ６が開かれると、バルブボディ５内の燃料が燃料噴射口４から噴射され、燃料噴射口４から噴射された燃料がノズルプレート３のノズル孔７を通過して外部に噴射されるようになっている。バルブボディ５は、正面側から見た形状が円形状であり（図４（ａ）参照）、先端側の外周面にリング状の係止用突起８が周方向に沿って形成されている（図４（ａ）〜（ｂ）参照）。係止用突起８は、断面形状（バルブボディ５の母線に沿った断面形状）が矩形形状であり、ノズルプレート３のアーム部１０が引っ掛けられるようになっている（図２（ｃ）〜（ｄ）、図４（ｃ）参照）。なお、ノズルプレートは、ＰＰＳ、ＰＥＥＫ、ＰＯＭ、ＰＡ、ＰＥＳ、ＰＥＩ、ＬＣＰ等の合成樹脂材料を使用して射出成形される。   As shown in FIG. 2, in the fuel injection device 1, a nozzle plate 3 made of a synthetic resin material is attached to the distal end side of a metal valve body 5 in which a fuel injection port 4 is formed. In the fuel injection device 1, the needle valve 6 is opened and closed by a solenoid (not shown). When the needle valve 6 is opened, fuel in the valve body 5 is injected from the fuel injection port 4. The fuel injected from the port 4 passes through the nozzle holes 7 of the nozzle plate 3 and is injected outside. The valve body 5 has a circular shape when viewed from the front side (see FIG. 4A), and ring-shaped locking projections 8 are formed in the circumferential direction on the outer peripheral surface on the distal end side ( (Refer FIG. 4 (a)-(b)). The locking projection 8 has a rectangular cross-sectional shape (cross-sectional shape along the generatrix of the valve body 5) so that the arm portion 10 of the nozzle plate 3 is hooked (FIGS. 2C to 2C). d), see FIG. 4 (c)). The nozzle plate is injection molded using a synthetic resin material such as PPS, PEEK, POM, PA, PES, PEI, and LCP.

（ノズルプレートの取付構造）
以下、図２乃至図５に基づき、本実施形態に係るノズルプレート３の取付構造を説明する。なお、図３（ａ）がノズルプレート３の正面図であり、図３（ｂ）が図３（ａ）のＣ２方向から見たノズルプレート３の側面図であり、図３（ｃ）が図３（ａ）のＡ２−Ａ２線に沿って切断して示すノズルプレート３の断面図である。また、図４（ａ）がバルブボディ５の先端側正面図であり、図４（ｂ）がバルブボディ５の先端側側面図であり、図４（ｃ）が図４（ａ）のＡ３−Ａ３線に沿って切断して示すバルブボディの先端側縦断面図である。また、図５（ａ）が図２（ｃ）の一部を拡大して示す図であり、図５（ｂ）がノズルプレート３とバルブボディ５の熱膨張差や製造誤差を吸収した第１状態の図であり、図５（ｃ）がノズルプレート３とバルブボディ５の熱膨張差や製造誤差を吸収した第２状態の図である。 (Nozzle plate mounting structure)
Hereinafter, based on FIG. 2 thru | or FIG. 5, the attachment structure of the nozzle plate 3 which concerns on this embodiment is demonstrated. 3A is a front view of the nozzle plate 3, FIG. 3B is a side view of the nozzle plate 3 viewed from the direction C2 in FIG. 3A, and FIG. It is sectional drawing of the nozzle plate 3 cut | disconnected and shown along the A2-A2 line | wire of 3 (a). 4A is a front view of the front end side of the valve body 5, FIG. 4B is a side view of the front end side of the valve body 5, and FIG. 4C is A3 in FIG. It is the front end side longitudinal cross-sectional view of the valve body cut | disconnected and shown along A3 line. FIG. 5A is an enlarged view of a part of FIG. 2C. FIG. 5B is a first view in which a difference in thermal expansion between the nozzle plate 3 and the valve body 5 and a manufacturing error are absorbed. FIG. 5C is a diagram of a state, and FIG. 5C is a diagram of a second state in which a difference in thermal expansion and a manufacturing error between the nozzle plate 3 and the valve body 5 are absorbed.

図２及び図３に示すように、ノズルプレート３は、バルブボディ５の先端側外周面１１に圧入される筒状嵌合部１２と、この筒状嵌合部１２の一端側を塞ぐように形成されてバルブボディ５の先端面１３が突き当てられる底壁部１４と、筒状嵌合部１２の他端側に一対形成されてバルブボディ５の係止用突起８に引っ掛けられるアーム部１０と、を一体に有する有底筒状体である。   As shown in FIGS. 2 and 3, the nozzle plate 3 is configured so as to block the cylindrical fitting portion 12 that is press-fitted into the outer peripheral surface 11 of the distal end side of the valve body 5 and one end side of the cylindrical fitting portion 12. A pair of bottom wall portion 14 that is formed and abutted against tip surface 13 of valve body 5, and arm portion 10 that is formed on the other end side of cylindrical fitting portion 12 and hooked on locking protrusion 8 of valve body 5. And a bottomed cylindrical body.

筒状嵌合部１２は、円筒形状であり、バルブボディ５の先端側にしまりばめの状態で嵌合されるように、内径寸法がバルブボディ５の外径寸法よりも僅かに小さく形成されている。この筒状嵌合部１２は、一端側が底壁部１４によって塞がれ、他端側がバルブボディ５の先端側を挿入できるように開口している。   The cylindrical fitting portion 12 has a cylindrical shape, and is formed with an inner diameter dimension slightly smaller than an outer diameter dimension of the valve body 5 so as to be fitted to the distal end side of the valve body 5 with an interference fit. ing. One end of the cylindrical fitting portion 12 is closed by the bottom wall portion 14, and the other end is opened so that the distal end side of the valve body 5 can be inserted.

底壁部１４は、燃料噴射装置１の燃料噴射口４から噴射された燃料を外部（吸気管２内）に向けて噴射するためのノズル孔７が複数（周方向に等間隔で６箇所）形成されている。この底壁部１４は、内面１７側（バルブボディ５の先端面１３に密着する面側）が平坦面であり、外面１８側の中央部２０が凹んでいる。すなわち、底壁部１４は、ノズル孔７が形成される中央部２０が円板状の薄肉部分であり、この薄肉部分を取り囲む領域であり且つ筒状嵌合部１２の一端側に接続される周縁部２１が中央部２０よりも肉厚に形成された厚肉部分である。なお、本実施形態において、ノズル孔７は、底壁部１４に合計６箇所形成されているが、これに限られず、要求される燃料噴射特性に応じた最適の個数及び孔径等が決定される。   The bottom wall portion 14 has a plurality of nozzle holes 7 (six locations at equal intervals in the circumferential direction) for injecting fuel injected from the fuel injection port 4 of the fuel injection device 1 toward the outside (inside the intake pipe 2). Is formed. The bottom wall portion 14 is a flat surface on the inner surface 17 side (the surface side in close contact with the tip surface 13 of the valve body 5), and the central portion 20 on the outer surface 18 side is recessed. That is, the bottom wall portion 14 has a central portion 20 in which the nozzle hole 7 is formed as a disk-shaped thin portion, is an area surrounding the thin portion, and is connected to one end side of the tubular fitting portion 12. The peripheral portion 21 is a thick portion formed thicker than the central portion 20. In the present embodiment, a total of six nozzle holes 7 are formed in the bottom wall portion 14, but the present invention is not limited to this, and the optimum number, hole diameter, etc. are determined according to the required fuel injection characteristics. .

アーム部１０は、筒状嵌合部１２の他端側の開口端から筒状嵌合部１２の母線に沿った方向へ突出するように形成されており、筒状嵌合部１２の他端側の周方向に１８０°の間隔で一対形成されている。このアーム部１０は、ノズルプレート３の側方から見た（図２（ａ）の矢印Ｃ１方向、及び図３（ａ）の矢印Ｃ２方向から見た）形状が四角形状であり、全体として略舌片状に形成されている。また、このアーム部１０は、ノズルプレート３がバルブボディ５に取り付けられる前の状態において、その外表面２２が筒状嵌合部１２の外周面２３と面一になっている（図３（ｃ）参照）。そして、このアーム部１０は、筒状嵌合部１２よりも径方向外方側へ撓み変形させられた（弾性変形させられた）状態で使用されるばね作用部分２４と、このばね作用部分２４の先端側に一体に形成された爪部分２５と、を有している。   The arm portion 10 is formed so as to protrude from the opening end on the other end side of the tubular fitting portion 12 in a direction along the generatrix of the tubular fitting portion 12, and the other end of the tubular fitting portion 12. A pair is formed at intervals of 180 ° in the circumferential direction on the side. The arm portion 10 has a quadrangular shape as viewed from the side of the nozzle plate 3 (viewed in the direction of arrow C1 in FIG. 2A and in the direction of arrow C2 in FIG. 3A), and is substantially as a whole. It is shaped like a tongue. Further, the arm portion 10 has an outer surface 22 that is flush with the outer peripheral surface 23 of the cylindrical fitting portion 12 before the nozzle plate 3 is attached to the valve body 5 (FIG. 3 (c). )reference). The arm portion 10 is used in a state where the arm portion 10 is bent and deformed (elastically deformed) radially outward from the cylindrical fitting portion 12, and the spring action portion 24. And a claw portion 25 integrally formed on the distal end side.

アーム部１０のばね作用部分２４の内表面２６（バルブボディ５に対向する面）は、ノズルプレート３がバルブボディ５に取り付けられた状態（特に、図２（ｃ）〜（ｄ）に示す状態）において、バルブボディ５の係止用突起８に接触することがないように、筒状嵌合部１２の内周面１５よりも径方向外方側に位置している。このように、アーム部１０のばね作用部分２４は、筒状嵌合部１２よりも薄肉に形成されており、他部よりも比較的容易に弾性変形できるようになっている。   The inner surface 26 (surface facing the valve body 5) of the spring acting portion 24 of the arm portion 10 is in a state where the nozzle plate 3 is attached to the valve body 5 (particularly, the states shown in FIGS. 2C to 2D). ), It is located radially outward from the inner peripheral surface 15 of the cylindrical fitting portion 12 so as not to contact the locking projection 8 of the valve body 5. Thus, the spring action part 24 of the arm part 10 is formed thinner than the cylindrical fitting part 12, and can be elastically deformed relatively easily than the other part.

アーム部１０の爪部分２５は、ばね作用部分２４の弾性力でバルブボディ５の係止用突起８に押し付けられる傾斜面２７が形成されている。この傾斜面２７は、ばね作用部分２４の内表面２６から径方向内方側へ向かって斜めに形成されており、係止用突起８の両エッジ２８，３０のうちのバルブボディ５の先端面１３から遠い位置にあるエッジ３０に当接するようになっている（図５（ａ）参照）。このような形状の傾斜面２７は、金属製のバルブボディ５と合成樹脂材料製のノズルプレート３とに熱膨張差や製造誤差が生じた場合に、主にばね作用部分２４が片持ち梁状に弾性変形してバルブボディ５とノズルプレート３の熱膨張差や製造誤差を吸収し、ばね作用部分２４の弾性力で係止用突起８のエッジ３０に常時当接して、係止用突起８のエッジ３０との当接部分に生じる斜面分力により、底壁部１４の内面１７をバルブボディ５の先端面１３に常時押し付ることを可能にする（図５（ｂ）〜図５（ｃ）参照）。その結果、ノズルプレート３をバルブボディ５の先端側に取り付けた後に、金属製のバルブボディ５と合成樹脂材料製のノズルプレート３に熱膨張差や製造誤差が生じた場合でも、ノズルプレート３の底壁部１４とバルブボディ５の先端面１３との間に隙間が生じることがなく、燃料の噴射圧力がノズルプレート３に作用しても、ノズルプレート３がバルブボディ５から脱落するようなことがない（図５（ｂ）〜図５（ｃ）参照）。   The claw portion 25 of the arm portion 10 is formed with an inclined surface 27 that is pressed against the locking protrusion 8 of the valve body 5 by the elastic force of the spring acting portion 24. The inclined surface 27 is formed obliquely from the inner surface 26 of the spring acting portion 24 toward the radially inward side, and the tip end surface of the valve body 5 of both edges 28 and 30 of the locking projection 8. 13 abuts on the edge 30 at a position far from 13 (see FIG. 5A). The inclined surface 27 having such a shape mainly has a spring acting portion 24 in a cantilever shape when a difference in thermal expansion or a manufacturing error occurs between the metal valve body 5 and the synthetic resin material nozzle plate 3. The elastic deformation of the valve body 5 and the nozzle plate 3 is absorbed to absorb the difference in thermal expansion and the manufacturing error, and the elastic action force of the spring acting portion 24 always abuts against the edge 30 of the locking protrusion 8 so that the locking protrusion 8 It is possible to always press the inner surface 17 of the bottom wall portion 14 against the distal end surface 13 of the valve body 5 by the slope component force generated at the contact portion with the edge 30 (FIG. 5B to FIG. 5). c)). As a result, even if a difference in thermal expansion or a manufacturing error occurs between the metal valve body 5 and the synthetic resin material nozzle plate 3 after the nozzle plate 3 is attached to the distal end side of the valve body 5, the nozzle plate 3 There is no gap between the bottom wall portion 14 and the front end surface 13 of the valve body 5, and the nozzle plate 3 falls off the valve body 5 even when fuel injection pressure acts on the nozzle plate 3. (See FIG. 5 (b) to FIG. 5 (c)).

また、アーム部１０の先端側であり且つ爪部分２５の先端側には、爪部分２５とバルブボディ５の先端側との係合を容易にすると共に、爪部分２５がバルブボディ５の係止用突起８を乗り越えやすくするための係合ガイド面３１が形成されている。この係合ガイド面３１は、一端が傾斜面２７の端部に接続され、他端がアーム部１０の先端面３２に接続され、傾斜面２７から遠ざかるにしたがってアーム部１０の外表面２２に近づくように傾斜している。このような形状の係合ガイド面３１は、ノズルプレート３をバルブボディ５の先端側に係合する際に、バルブボディ５の先端のエッジ３３に当接して緩やかにばね作用部分２４を撓み変形させると共に、爪部分２５が係止用突起８を乗り越える際に、係止用突起８のエッジ２８に当接して緩やかにばね作用部分２４を撓み変形させる。その結果、ノズルプレート３とバルブボディ５の組立作業が円滑且つ容易に行える。   Further, on the distal end side of the arm portion 10 and on the distal end side of the claw portion 25, the engagement between the claw portion 25 and the distal end side of the valve body 5 is facilitated, and the claw portion 25 engages with the valve body 5. An engagement guide surface 31 is formed to make it easier to get over the projection 8. One end of the engagement guide surface 31 is connected to the end portion of the inclined surface 27, the other end is connected to the distal end surface 32 of the arm portion 10, and approaches the outer surface 22 of the arm portion 10 as the distance from the inclined surface 27 increases. So as to be inclined. When the nozzle plate 3 is engaged with the distal end side of the valve body 5, the engagement guide surface 31 having such a shape is brought into contact with the edge 33 at the distal end of the valve body 5 to gently bend and deform the spring acting portion 24. In addition, when the claw portion 25 gets over the locking projection 8, the spring acting portion 24 is gently bent and deformed by coming into contact with the edge 28 of the locking projection 8. As a result, the assembly work of the nozzle plate 3 and the valve body 5 can be performed smoothly and easily.

（第１実施形態の効果）
以上のような本実施形態に係るノズルプレート３の取付構造によれば、ノズルプレート３の筒状嵌合部１２をバルブボディ５の先端側に圧入すると共に、ノズルプレート３のアーム部１０の爪部分２５をバルブボディ５の係止用突起８に引っ掛けるだけで、ノズルプレート３がバルブボディ５の先端側に固定されるため、金属製のノズルプレート１０３を金属製のバルブボディ１０２の先端に溶接固定する従来例に比較し（図１０参照）、燃料噴射装置１の製造工数を削減でき、燃料噴射装置１の製造コストを削減できる。 (Effect of 1st Embodiment)
According to the mounting structure of the nozzle plate 3 according to the present embodiment as described above, the cylindrical fitting portion 12 of the nozzle plate 3 is press-fitted into the distal end side of the valve body 5 and the claws of the arm portion 10 of the nozzle plate 3 are inserted. Since the nozzle plate 3 is fixed to the distal end side of the valve body 5 simply by hooking the portion 25 on the locking projection 8 of the valve body 5, the metal nozzle plate 103 is welded to the distal end of the metal valve body 102. Compared to the conventional example to be fixed (see FIG. 10), the number of manufacturing steps of the fuel injection device 1 can be reduced, and the manufacturing cost of the fuel injection device 1 can be reduced.

また、本実施形態に係るノズルプレート３の取付構造によれば、ノズルプレート３とバルブボディ５との熱膨張差や製造誤差が生じた場合に、ノズルプレート３の主にアーム部１０のばね作用部分２４が弾性変形してノズルプレート３とバルブボディ５との熱膨張差や製造誤差を吸収し、アーム部１０の爪部分２５の傾斜面２７がバルブボディ５の係止用突起８にばね作用部分２４の弾性力で常時押し付けられ、ノズルプレート３の底壁部１４が傾斜面２７に作用する斜面分力でバルブボディ５の先端面１３に常時押し付けられるようになっているため、燃料の噴射圧力がノズルプレート３に作用しても、ノズルプレート３がバルブボディ５から脱落するようなことがない。   Further, according to the mounting structure of the nozzle plate 3 according to the present embodiment, when a difference in thermal expansion between the nozzle plate 3 and the valve body 5 or a manufacturing error occurs, the spring action of mainly the arm portion 10 of the nozzle plate 3. The portion 24 is elastically deformed to absorb a difference in thermal expansion and a manufacturing error between the nozzle plate 3 and the valve body 5, and the inclined surface 27 of the claw portion 25 of the arm portion 10 acts as a spring on the locking protrusion 8 of the valve body 5. Since it is always pressed by the elastic force of the portion 24 and the bottom wall portion 14 of the nozzle plate 3 is always pressed against the tip surface 13 of the valve body 5 by the slope component force acting on the slope 27, fuel injection Even if the pressure acts on the nozzle plate 3, the nozzle plate 3 does not fall off the valve body 5.

また、本実施形態に係るノズルプレート３の取付構造によれば、ノズルプレート３の筒状嵌合部１２をバルブボディ５の先端側に圧入すると共に、ノズルプレート３のアーム部１０の爪部分２５をバルブボディ５の係止用突起８に引っ掛けるだけで、ノズルプレート３がバルブボディ５の先端側に固定されるため、金属製のノズルプレート１０３を金属製のバルブボディ１０２の先端に溶接固定する従来例のような不具合（溶接スパッタでノズル孔１０４が塞がれるという不具合）が生じることがなく（図１０参照）、全てのノズル孔７が燃料の微粒化のための機能を確実に発揮する。   Further, according to the mounting structure of the nozzle plate 3 according to the present embodiment, the cylindrical fitting portion 12 of the nozzle plate 3 is press-fitted into the distal end side of the valve body 5, and the claw portion 25 of the arm portion 10 of the nozzle plate 3. Since the nozzle plate 3 is fixed to the distal end side of the valve body 5 simply by hooking it on the locking protrusion 8 of the valve body 5, the metal nozzle plate 103 is welded and fixed to the distal end of the metal valve body 102. There is no occurrence of a problem as in the conventional example (a problem that the nozzle hole 104 is blocked by welding spatter) (see FIG. 10), and all the nozzle holes 7 reliably perform the function for atomizing the fuel. .

なお、本実施形態に係るノズルプレート３の取付構造において、爪部分２５は、その内側（バルブボディ５に対向する面側）の断面形状（中心軸１６に沿った断面形状）が傾斜面２７と係合ガイド面３１とによって三角形状になっており、傾斜面２７と係合ガイド面３１とによって形作られる稜線が他部（爪部分２５のうちの稜線以外の部分）よりも径方向内方側（中心軸１６寄り）に位置している。   In the mounting structure of the nozzle plate 3 according to the present embodiment, the claw portion 25 has a cross-sectional shape (a cross-sectional shape along the central axis 16) on the inner side (surface facing the valve body 5) with the inclined surface 27. The engagement guide surface 31 has a triangular shape, and the ridgeline formed by the inclined surface 27 and the engagement guide surface 31 is radially inward from the other portion (the portion other than the ridgeline in the claw portion 25). Located near the center axis 16.

また、本実施形態に係るノズルプレート３の取付構造において、爪部分２５は、その傾斜面２７の傾斜角度が４５°のものを例示したが（図３（ｃ）参照）、これに限られず、ノズルプレート３とバルブボディ５の熱膨張差等に応じた最適の傾斜角度の傾斜面２７が形成される。   Further, in the mounting structure of the nozzle plate 3 according to the present embodiment, the claw portion 25 is exemplified by the inclined surface 27 having an inclination angle of 45 ° (see FIG. 3C), but is not limited thereto. An inclined surface 27 having an optimum inclination angle corresponding to the difference in thermal expansion between the nozzle plate 3 and the valve body 5 is formed.

また、本実施形態に係るノズルプレート３の取付構造において、ノズルプレート３及びバルブボディ５の正面側形状は、円形に限られず、六角形状等の多角形状、Ｄ形状、小判型形状、その他の形状でもよい。   In the mounting structure of the nozzle plate 3 according to the present embodiment, the front side shape of the nozzle plate 3 and the valve body 5 is not limited to a circle, but a polygonal shape such as a hexagonal shape, a D shape, an oval shape, and other shapes. But you can.

［第２実施形態］
図６乃至図９は、本発明の第２実施形態に係るノズルプレート３の取付構造を示す図である。なお、本実施形態に係るノズルプレート３の取付構造の説明は、図６乃至図９において、第１実施形態のノズルプレート３の取付構造と共通する構成部分には同一符号を付することにより、第１実施形態のノズルプレート３の説明と重複する説明を省略する。 [Second Embodiment]
6 to 9 are views showing the nozzle plate 3 mounting structure according to the second embodiment of the present invention. In addition, the description of the attachment structure of the nozzle plate 3 according to the present embodiment will be described by assigning the same reference numerals to the components common to the attachment structure of the nozzle plate 3 of the first embodiment in FIGS. A description overlapping the description of the nozzle plate 3 of the first embodiment is omitted.

本実施形態の係るノズルプレート３の取付構造は、バルブボディ５の係止用突起８に傾斜面３４が形成され、ノズルプレート３のアーム部１０の爪部分２５がアーム部１０のばね作用部分２４によって係止用突起８の傾斜面３４に弾性的に押し付けられている（図９（ａ）参照）。   In the mounting structure of the nozzle plate 3 according to this embodiment, an inclined surface 34 is formed on the locking projection 8 of the valve body 5, and the claw portion 25 of the arm portion 10 of the nozzle plate 3 is the spring acting portion 24 of the arm portion 10. Is elastically pressed against the inclined surface 34 of the locking projection 8 (see FIG. 9A).

このような本実施形態に係るノズルプレート３の取付構造によれば、金属製のバルブボディ５と合成樹脂材料製のノズルプレート３とに熱膨張差や製造誤差が生じた場合に、ばね作用部分２４が片持ち梁状に弾性変形してバルブボディ５とノズルプレート３の熱膨張差や製造誤差を吸収し、ばね作用部分２４の弾性力で爪部分２５が係止用突起８の傾斜面３４に常時当接して、係止用突起８の傾斜面３４と爪部分２５の当接部分に生じる斜面分力により、底壁部１４の内面１７をバルブボディ５の先端面１３に常時押し付けることができる（図９（ｂ）参照）。その結果、ノズルプレート３をバルブボディ５の先端側に取り付けた後に、金属製のバルブボディ５と合成樹脂材料製のノズルプレート３に熱膨張差や製造誤差が生じた場合でも、ノズルプレート３の底壁部１４とバルブボディ５の先端面１３との間に隙間が生じることがなく、燃料の噴射圧力がノズルプレート３に作用しても、ノズルプレート３がバルブボディ５から脱落するようなことがない（図９（ｂ）〜図９（ｃ）参照）。   According to the mounting structure of the nozzle plate 3 according to this embodiment, when a difference in thermal expansion or a manufacturing error occurs between the metal valve body 5 and the nozzle plate 3 made of synthetic resin material, the spring acting portion 24 is elastically deformed into a cantilever shape to absorb a difference in thermal expansion and a manufacturing error between the valve body 5 and the nozzle plate 3, and the claw portion 25 is inclined to the inclined surface 34 of the locking projection 8 by the elastic force of the spring acting portion 24. The inner surface 17 of the bottom wall portion 14 can always be pressed against the distal end surface 13 of the valve body 5 by the inclined component force generated at the contact portion between the inclined surface 34 of the locking projection 8 and the claw portion 25. (See FIG. 9B). As a result, even if a difference in thermal expansion or a manufacturing error occurs between the metal valve body 5 and the synthetic resin material nozzle plate 3 after the nozzle plate 3 is attached to the distal end side of the valve body 5, the nozzle plate 3 There is no gap between the bottom wall portion 14 and the front end surface 13 of the valve body 5, and the nozzle plate 3 falls off the valve body 5 even when fuel injection pressure acts on the nozzle plate 3. (See FIGS. 9B to 9C).

以上のような本実施形態に係るノズルプレートの取付構造によれば、上記第１実施形態に係るノズルプレート３の取付構造と同様の効果を得ることができる。   According to the mounting structure of the nozzle plate according to the present embodiment as described above, the same effect as that of the mounting structure of the nozzle plate 3 according to the first embodiment can be obtained.

なお、本実施形態に係るノズルプレートの取付構造において、爪部分２５は、その内側の断面形状がノズルプレート３の径方向内方へ向かって出っ張る三角形状であり、その三角形状の頂部が係止用突起８の傾斜面３４に当接するようになっている。   In the nozzle plate mounting structure according to the present embodiment, the claw portion 25 has a triangular shape whose inner cross-sectional shape protrudes inward in the radial direction of the nozzle plate 3, and the top of the triangular shape is locked. The protrusion 8 is in contact with the inclined surface 34.

また、本実施形態に係るノズルプレートの取付構造において、係止用突起８の傾斜面３４は、その傾斜角度が４５°のものを例示したが（図８参照）、これに限られず、ノズルプレート３とバルブボディ５の熱膨張差や製造誤差等に応じた最適の傾斜角度に形成される。   Further, in the nozzle plate mounting structure according to the present embodiment, the inclined surface 34 of the locking projection 8 is exemplified as having an inclination angle of 45 ° (see FIG. 8). 3 and the valve body 5 are formed at an optimum inclination angle corresponding to a difference in thermal expansion, a manufacturing error, and the like.

［変形例１］
上記第１実施形態及び第２実施形態において、アーム部１０は、筒状嵌合部１２の他端側の周方向に１８０°の間隔で一対形成する態様を例示したが、これに限られず、少なくとも１箇所（１箇所以上）形成されていればよい。 [Modification 1]
In the said 1st Embodiment and 2nd Embodiment, although the arm part 10 illustrated the aspect which forms a pair at a 180 degree space | interval in the circumferential direction of the other end side of the cylindrical fitting part 12, it is not restricted to this, At least one place (one or more places) may be formed.

［変形例２］
上記第１実施形態及び第２実施形態において、図４（ｂ）及び図８（ｂ）で示す係止用突起８のエッジ２８に対応する部分を面取り（Ｃ面取り、Ｒ面取り等）することにより、爪部分２５が係止用突起８を乗り越える際に、爪部分２５が係止用突起８の面取りされた部分に当接して緩やかにばね作用部分２４を撓み変形させる。その結果、ノズルプレート３とバルブボディ５の組立作業が円滑且つ容易に行える。 [Modification 2]
In the first embodiment and the second embodiment, by chamfering the portion corresponding to the edge 28 of the locking projection 8 shown in FIGS. 4B and 8B (C chamfering, R chamfering, etc.). When the claw portion 25 gets over the locking projection 8, the claw portion 25 comes into contact with the chamfered portion of the locking projection 8 to gently bend and deform the spring acting portion 24. As a result, the assembly work of the nozzle plate 3 and the valve body 5 can be performed smoothly and easily.

１……燃料噴射装置、３……ノズルプレート（燃料噴射装置用ノズルプレート）、４……燃料噴射口、５……バルブボディ、７……ノズル孔、８……係止用突起、１０……アーム部、１２……筒状嵌合部、１３……先端面、１４……底壁部、２４……ばね作用部分、２５……爪部分、２７，３４……傾斜面   DESCRIPTION OF SYMBOLS 1 ... Fuel injection device, 3 ... Nozzle plate (nozzle plate for fuel injection devices), 4 ... Fuel injection port, 5 ... Valve body, 7 ... Nozzle hole, 8 ... Locking protrusion, 10 ... ... arm part, 12 ... cylindrical fitting part, 13 ... tip face, 14 ... bottom wall part, 24 ... spring acting part, 25 ... claw part, 27, 34 ... inclined surface

Claims (3)

燃料噴射装置の燃料噴射口から流出した燃料を微粒化して噴射するノズル孔が形成された燃料噴射装置用ノズルプレートの取付構造において、
前記燃料噴射口が形成された前記燃料噴射装置の金属製バルブボディは、外周に沿ってリング状の係止用突起が形成され、
前記燃料噴射装置用ノズルプレートは、前記バルブボディの先端側が圧入される筒状嵌合部と、前記筒状嵌合部の一端側を塞ぐように形成されて前記バルブボディの先端面が突き当てられると共に前記ノズル孔が形成された底壁部と、前記筒状嵌合部の他端側に形成されて前記バルブボディの前記係止用突起に引っ掛けられるアーム部と、を有し、
前記燃料噴射装置用ノズルプレートの前記筒状嵌合部、前記底壁部、及び前記アーム部は、合成樹脂材料で一体に形成され、
前記アーム部は、弾性変形させられた状態で使用されるばね作用部分と、このばね作用部分の先端側に一体に形成されて前記ばね作用部分の弾性力で前記係止用突起に押し付けられる爪部分と、を有し、
前記爪部分と前記係止用突起のいずれか一方には、前記爪部分と前記係止用突起のいずれか他方に当接する傾斜面が形成され、
前記傾斜面は、前記バルブボディと前記燃料噴射装置用ノズルプレートに熱膨張差が生じた場合でも、前記爪部分と前記係止用突起のいずれか他方に前記ばね作用部分の弾性力で当接し、前記底壁部を前記バルブボディの先端面に押し付ける斜面分力が生じるようになっている、
ことを特徴とする燃料噴射装置用ノズルプレートの取付構造。 In the mounting structure of the nozzle plate for the fuel injection device in which the nozzle hole for atomizing the fuel flowing out from the fuel injection port of the fuel injection device is formed,
The metal valve body of the fuel injection device in which the fuel injection port is formed has a ring-shaped locking protrusion formed along the outer periphery,
The nozzle plate for the fuel injection device is formed so as to close a cylindrical fitting portion into which the distal end side of the valve body is press-fitted, and one end side of the cylindrical fitting portion, and the distal end surface of the valve body abuts And a bottom wall portion in which the nozzle hole is formed, and an arm portion that is formed on the other end side of the cylindrical fitting portion and is hooked on the locking projection of the valve body,
The cylindrical fitting portion, the bottom wall portion, and the arm portion of the fuel injection device nozzle plate are integrally formed of a synthetic resin material,
The arm portion is a spring acting portion that is used in an elastically deformed state, and a claw that is integrally formed on the distal end side of the spring acting portion and is pressed against the locking projection by the elastic force of the spring acting portion. And having a portion,
Either one of the claw portion and the locking projection is formed with an inclined surface that comes into contact with the other of the claw portion and the locking projection,
Even if a difference in thermal expansion occurs between the valve body and the nozzle plate for the fuel injection device, the inclined surface abuts on the other of the claw portion and the locking projection by the elastic force of the spring acting portion. In addition, a slope component force that presses the bottom wall portion against the tip surface of the valve body is generated.
A structure for mounting a nozzle plate for a fuel injection device. 前記アーム部は、前記ばね作用部分が前記係止用突起に接触しないように、前記ばね作用部分が前記筒状嵌合部よりも薄肉に形成された、
ことを特徴とする請求項１に記載の燃料噴射装置用ノズルプレートの取付構造。 The arm portion is formed so that the spring acting portion is thinner than the tubular fitting portion so that the spring acting portion does not contact the locking projection.
The nozzle plate mounting structure for a fuel injection device according to claim 1. 前記アーム部の先端側であり且つ前記爪部分の先端側には、前記爪部分と前記バルブボディの先端側との係合を容易にすると共に、前記爪部分が前記係止用突起を乗り越えやすくするための係合ガイド面が形成された、
ことを特徴とする請求項１又は２に記載の燃料噴射装置用ノズルプレートの取付構造。 On the distal end side of the arm portion and on the distal end side of the claw portion, the engagement between the claw portion and the distal end side of the valve body is facilitated, and the claw portion easily gets over the locking projection. An engagement guide surface is formed,
The nozzle injection plate mounting structure for a fuel injection device according to claim 1 or 2.
JP2013200198A 2013-09-26 2013-09-26 Nozzle plate mounting structure for fuel injection device Active JP6143623B2 (en)

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JP2013200198A JP6143623B2 (en) 2013-09-26 2013-09-26 Nozzle plate mounting structure for fuel injection device
CN201480052564.8A CN105579699B (en) 2013-09-26 2014-09-19 The installation constitution of fuel injection device nozzle plate
US15/025,003 US20160237968A1 (en) 2013-09-26 2014-09-19 Attachment structure of fuel injection device nozzle plate
EP14850083.8A EP3051116B1 (en) 2013-09-26 2014-09-19 Attachment structure of nozzle plate for fuel injection device
PCT/JP2014/074779 WO2015046029A1 (en) 2013-09-26 2014-09-19 Attachment structure of nozzle plate for fuel injection device

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JP7169365B2 (en) 2018-04-25 2022-11-10 ロベルト・ボッシュ・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング Fuel injector valve seat assembly including insert alignment retention feature
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